Substance-extraction device and machine for producing drinks

ABSTRACT

The invention relates to a device which is used to extract a substance in order to produce drinks, comprising a plurality of brewing chambers ( 7, 8 ), and a machine comprising one such device. According to the invention, the device comprises an interface ( 6 ) which is used to connect to a hot water supply inlet and means of distributing said hot water between the brewing chambers ( 7, 8 ) containing a substance that is to be infused. For each brewing chamber ( 7, 8 ), the aforementioned distribution means comprise means for detecting the presence of the substance to be infused and means for opening the hot water inlet into the brewing chamber ( 7, 8 ) upon detection of said substance. The invention is particularly suitable for making espresso coffee.

The invention relates to a device which is used to extract a substance in order to produce drinks comprising a plurality of brewing chambers.

It also relates to a machine incorporating the device according to the invention.

The invention is particularly suitable for producing drinks of the espresso coffee type, produced by pressurized hot water infusion of ground coffee.

More precisely, the invention may be applied to coffee machines able to use packages of the substance to be infused (ground coffee in particular) in the form of sachets made of filter paper.

The variety of consumer demands (coffees of various origins, decaffeinated coffee, etc) as well as concerns for productivity have led manufacturers of coffee machines to propose machines for producing a plurality of espresso coffees.

In this connection, Document EP-A-1 219 216 describes an automatic device for extracting a substance such as ground coffee, with, according to a particular embodiment, two brewing chambers which are parallel and supplied directly by two hot water supply lines.

Such a machine allows the simultaneous production of several drinks, but involves a multiplication of the means required for this purpose, according to the number of brewing chambers made. In particular, the electric controls and the hot water supply circuits must be multiplied to take account of the number of brewing chambers.

Furthermore, according to this prior art, the multiplication of the number of brewing chambers entails a general adaptation of the coffee machine calling into question its entire design and manufacture.

The invention constitutes significant technical progress with regard to the known prior art in the area concerned.

A first aim of the invention is to propose a device used to extract a substance making it possible to operate selectively or simultaneously a plurality of brewing chambers on the basis of a machine not initially comprising specific means for controlling supply to each brewing chamber, nor a separate supply circuit for each of the brewing chambers.

One advantage of this configuration of the invention is that it allows it to be adapted onto existing machines, at the pressurized hot water outlet of a conventional coffee machine.

The invention can therefore be embodied in relation to an existing machine by means of a connection interface and makes it possible, by connecting to a single source supplying hot water to the machine, to produce several drinks.

Another aim of the invention is to ensure the simultaneous or selective operation of the plurality of the brewing chambers without the need for additional control means for opening or closing the hot water inlet pipes in each brewing chamber.

In particular, by using the device of the invention, it is not necessary to add electromechanical systems of valves connected to control means on the front panel of the machine for operation by the user. The closing or opening of the hot water inlet circuits in each of the brewing chambers actually takes place automatically.

Consequently, by this invention, a device is manufactured that can be adapted to a coffee machine of standard design (and in particular designed to operate with a single brewing chamber per pressurized hot water supply source) without requiring changes to the body of the machine or to its control means.

Other aims and advantages of the invention will appear in the following description of a preferred embodiment which is however not restrictive.

The invention relates to a device which is used to extract a substance in order to produce drinks, comprising a plurality of brewing chambers, characterized in that

It comprises an interface used to connect to a hot water supply inlet and means for distributing said hot water between the brewing chambers containing a substance to be infused.

According to the preferred embodiments this extraction device is such that:

For each brewing chamber, the distributing means comprise means for detecting the presence of a substance to be infused and means for opening the hot water inlet into the brewing chamber upon detection of the presence of the substance to be infused,

It comprises, for each brewing chamber, a mobile member between:

-   -   a hot water inlet shutoff position in which one end of the         mobile member is deployed inside the brewing chamber,     -   a hot water inlet open position in which said end of the mobile         member is retracted from the brewing chamber by bearing on the         substance to be infused,

The brewing chambers are formed in part in a fixed component and in part in a mobile component between an open position and a closed position of the brewing chambers,

The fixed component and the mobile component are connected by swivel pin,

The mobile component is actuated by a lever mounted by pin on the fixed component and comprising at least one oblong hole cooperating with a guide finger on the mobile component,

The guide finger has a rectangular section and is mounted swiveling in relation to the mobile component,

At least one portion of the wall of the oblong hole comprises a slip coating,

The mobile component comprises, for each brewing chamber a filtering cup supported by a holder of adjustable height inside a housing formed in the mobile component,

It comprises two brewing chambers each with a mounted holder adjustable in height inside its housing by a pressure screw serving also to mount a guide finger.

The invention also relates to a machine for producing drinks from a substance to be infused comprising a hot water supply source and comprising a device of the invention.

The drawings attached are given as examples and are not restrictive of the invention. They represent only one embodiment of the invention and will enable it to be easily understood.

FIGS. 1 to 3 present respectively the front, side and perspective views of a machine for producing drinks of the espresso coffee type according to a first embodiment.

FIGS. 4 to 6 illustrate respectively the side, front and perspective views of a machine for producing drinks of the espresso coffee type in a second embodiment in which a device of the invention is incorporated at the level of a hot water supply outlet pipe, while another hot water supply pipe remains with a conventional filter and filter holder device with a single brewing chamber.

FIGS. 7 and 8 illustrate a particular embodiment of the opening and closing system of the brewing chambers of the device.

FIG. 9 is an exploded view of the device of the invention.

FIGS. 10 to 12 illustrate three cases of operation of the device of the invention with two brewing chambers.

FIG. 13 and FIG. 14 show more precisely the operation of the device of the invention in partial view for one brewing chamber.

The following description describes an embodiment of the invention suitable for the use of packages of a substance to be infused (such as ground coffee) in the form of sachets made of filter paper.

In the case of FIGS. 1 to 3, a device 5 according to the invention is related to a coffee machine 1 of conventional design.

In particular, such a machine comprises a body 3 able to contain the means for producing and pressurizing hot water, as well as the electromechanical means for distributing said hot water.

The coffee machine 1 also comprises conventionally a front panel 2 able to receive various control means in the form of buttons for the functions of startup, and of activation of the pump in particular.

As shown in FIGS. 1 to 3, the device 5 according to the invention can cooperate with a coffee machine 1 of standard design at the existing pressurized hot water outlet pipe to supply continuously a filter and filter holder system able to receive the substance to be infused and constituting the usual single brewing chamber.

FIG. 3 shows in general that it is possible by means of the device 5 of the invention to constitute a plurality of brewing chambers 7, 8, by cooperation with a single hot water supply pipe.

FIGS. 4 to 6 show another example of application of the device of the invention to a coffee machine 1 comprising two hot water outlet pipes usually allowing operation with a single brewing chamber each.

According to the example indicated, a device 5 is installed at one of the hot water supply pipes while a conventional system is retained at the other pipe.

In each case, it will be noted that the remainder of coffee machine 1 and in particular the means for controlling and distributing the hot water circuit have not been altered.

To achieve this result the extraction device 5 according to the invention has the characteristic of comprising an interface 6 used to connect to a hot water supply inlet 4, and means for distributing said hot water between the brewing chambers 7, 8 containing a substance that is to be infused 13 a, 13 b.

FIG. 7 shows an example of connection interface 6 as does FIG. 9 which illustrates it in exploded view. In particular, the connection interface 6 may be in the form of a unit comprising a central opening able to be connected to a supply inlet 4 (or supply pipe) of the coffee machine. It is possible in particular to use standard securing means such as screws to secure the interface 6 to the body of coffee machine 1.

Of course, the securing configuration (exterior dimension and positioning of the screws) of the interface 6 will be adapted to the type of coffee machine 1 to which connection is desired.

The extraction device also comprises means of distributing the hot water between the various brewing chambers 7, 8 containing a substance to be infused 13 a, 13 b.

The examples illustrated in the figures apply to the case in which two brewing chambers 7, 8 are constituted at a device 5. However, this case is not restrictive.

In order to distribute the hot water in the brewing chambers containing the substance to be infused 13 a, 13 b without fundamental changes to coffee machine 1, device 5 comprises for each brewing chamber 7, 8 means for detecting the presence of the substance to be infused 13 a, 13 b, and means for opening the hot water inlet into brewing chamber 7, 8 upon detection of the presence of the substance to be infused 13 a, 13 b.

Thus, automatically, the circuit of hot water inlet into a brewing chamber 7, 8 is opened by the simple pressure of the substance to be infused 13 a, 13 b.

According to the embodiment illustrated in the figures, and in particular in FIGS. 9 to 14, the detection means and the means of opening the hot water inlet of each brewing chamber 7, 8 consist of a mobile member 29 a, 29 b.

Advantageously, the mobile member 29 a, 29 b receives at its bottom end a conventional spout system 24 a, 24 b able to distribute the incoming hot water on to the substance to be infused 13 a, 13 b.

In idle position, the mobile member 29 a, 29 b has a bottom end projecting into the interior volume of the brewing chamber 7, 8.

This idle position is ensured by default by elastic means of standard design, for example by springs 25 a, 25 b positioned inside a housing in the connection interface 6 making it possible to press the mobile member 29 a, 29 b on the rim of the hot water inlet into the brewing chamber 7, 8.

To ensure leaktightness in this position, the mobile member 29 a, 29 b receives a seal 27 a, 27 b, for example of the O-ring type making it possible, in this configuration, to close the hot water inlet of brewing chamber 7, 8 concerned.

Mobile member 29 a, 29 b may assume another position able to open the hot water inlet into the brewing chamber 7, 8.

This is the case in particular in FIG. 11 for the brewing chamber 7.

Here, the presence of a substance to be infused 13 a has caused the bottom end of the mobile member 29 a to bear on the upper surface of the substance to be infused in sachet 13 a which has caused the mobile member 29 a to retract from the volume of the brewing chamber 7. In doing so, the spring 25 a has been constrained. Moreover, the retraction of the mobile member 29 a has caused the gasket 27 a to detach from the application surface in order to open the hot water inlet into the brewing chamber 7 as represented by the arrows showing the passage of the water.

The hot water coming from the supply inlet 4 at the connection interface 6 passes through the hot water inlet of the brewing chamber 7 to infuse the substance 13 a present. The drink produced is then delivered at a flow nozzle 14 a extending a funneling part for delivering the drink.

FIGS. 10 to 12 illustrate three operating configurations of two brewing chambers 7, 8 of the device 5.

In the case of FIG. 10, the two brewing chambers 7, 8 are in an inactive position and no substance to be infused in sachet 13 a, 13 b is present. Consequently, the mobile members 29 a, 29 b are both deployed in the internal volume of each brewing chamber 7, 8 by closing the hot water inlet.

In the case of FIG. 11, a substance to be infused in sachet 13 a is present in the brewing chamber 7. On the other hand, the brewing chamber 8 has remained empty. Consequently, only the mobile member 29 a is retracted to open the hot water supply circuit. The mobile member 29 b remains in shutoff position of the hot water inlet of the corresponding chamber 8.

There follows the production of a single drink in the brewing chamber 7.

Another alternative is presented in FIG. 12 in which substances to be infused in sachets 13 a, 13 b are present in each of the brewing chambers 7, 8. Consequently, the two mobile members 29 a, 29 b are retracted so as to open the hot water inlet of each brewing chamber 7, 8. Consequently, a drink is produced in each brewing chamber.

FIGS. 13 and 14 show enlarged partial views of the preferred embodiment of the invention illustrated in FIGS. 9 to 12. In particular, FIG. 13 shows a brewing chamber in closed and non-operating position while FIG. 14 shows a brewing chamber in hot water supply open position for the production of a drink.

Still with reference to the figures, an example is given below of embodiment of the opening and closing of the brewing chambers 7, 8 for the entry or withdrawal of the substance to be infused in sachets 13 a, 13 b.

Referring particularly to FIGS. 7 to 9, it is observed that the plurality of brewing chambers 7, 8 is formed in part (upper part) in a fixed component 9, and in part (lower part) in a mobile component 10. It is the movement of the mobile component 10 which ensures the opening or closing of a brewing chamber 7, 8.

The part of the brewing chambers 7, 8 present in the fixed component 9 consists of cavities formed in the lower surface of the fixed component 9 and forms the zone of application of the hot water onto the substance to be infused 13 a, 13 b. It is here that the spout 24 a, 24 b is received.

The mobile component 10 comprises a plurality of housings 23 a, 23 b each able to receive in its lower part a flow nozzle 14 a, 14 b equipped with a funnel and, in the upper part a cup holder 11 a, 11 b holding a cup 12 a, 12 b for reception of the substance to be infused in sachet 13 a, 13 b.

Advantageously, the position of each cup holder 11 a, 11 b is adjustable in height in particular for fine adjustment of the pressure exerted by the rim of the cup on the rim of the sachet 13 a, 13 b in closed position with regard to the fixed component 9.

As an example, each holder 11 a, 11 b may comprise a thread coacting cooperating with an interior tapping of the housing 23 a, 23 b to form a helicoidal slide able to raise or lower the cup holder 11 a, 11 b. The final securing in position of the holder 11 a, 11 b is carried out by means of a pressure screw 15 a, 15 b. This configuration is shown in detail in FIGS. 13 and 14. As concerns the opening or closing actuation of the mobile component 10, it may be carried out by means of a lever 18 which is actuated manually by the user.

The fixed and mobile components 9, 10 are connected by a swivel pin 19 and are also connected kinematically with two arms 16 a, 16 b forming one piece with the lever 18.

More particularly, each arm 16 a, 16 b is mounted swiveling on the fixed component 9 by means of two pins 17 a, 17 b which are clearly shown in FIG. 9. In relation to the mobile component 10, the arms 16 a, 16 b each comprise an oblong hole 20 a, 20 b coacting in translation with a guide finger 21 a, 21 b mounted on the mobile component 10.

Advantageously, guide finger 21 a, 21 b has a rectangular section and is mounted swiveling in relation to mobile component 10, for example by means of a screw 15 a, 15 b.

Advantageously, the mounting screw of each guide finger 21 a, 21 b is the same screw 15 a, 15 b as that used to hold in position cup holders 11 a, 11 b.

Given the friction existing between the wall of oblong hole 20 a, 20 b and the surface of guide fingers 21 a, 21 b, it may be useful to place a slip coating 22 a, 22 b on at least one portion of the wall of oblong holes 20 a, 20 b.

This will be a coating having a low friction coefficient, and good wear resistance in relation to the materials used to constitute the arms 16 a, 16 b.

In the open position of brewing chambers 7, 8, lever 18 is raised and allows the entry of the sachets 13 a, 13 b, as shown in FIGS. 7 and 8. An action by the user on lever 18 to cause it to rotate downwards allows the closure of brewing chambers 7, 8 to reach an operating configuration as presented in FIGS. 10 to 14.

It will be noted that the downward orientation of lever 18 to achieve opening allows easy application of the effort of closure by the user and guarantees correct closure of brewing chambers 7, 8 for perfect leaktightness.

Of course, the various components of device 5 of the invention and in particular connection interface 6, fixed component 9 and mobile component 10 coact together in a leaktight manner by means of seals shown at reference marks 26 a, 26 b, and 28 a, 28 b.

It is also obvious that the example illustrated with two brewing chambers 7, 8 could be reproduced with another number of brewing chambers 7, 8, without going beyond the context of this invention.

REFERENCES

-   1. Coffee machine -   2. Front panel -   3. Body -   4. Supply inlet -   5. Device -   6. Interface -   7. Brewing chamber -   8. Brewing chamber -   9. Fixed component -   10. Mobile component -   11 a, 11 b. Cup holder -   12 a, 12 b. Cups -   13 a, 13 b. Substance to be infused in sachet -   14 a, 14 b. Flow nozzle -   15 a, 15 b. Mounting screw -   16 a, 16 b. Arm -   17 a, 17 b. Pin -   18. Lever -   19. Swivel pin -   20 a, 20 b. Oblong hole -   21 a, 21 b. Guide finger -   22 a, 22 b. Slip coating -   23 a, 23 b. Housing -   24 a, 24 b. Spout -   25 a, 25 b. Spring -   26 a, 26 b. Seal -   27 a, 27 b. Seal -   28 a, 28 b. Seal -   29 a, 29 b. Mobile member 

1. Substance extraction device (5) for producing drinks, comprising a plurality of brewing chambers (7, 8), comprising an interface (6) which is used to connect to a hot water supply inlet and means of distributing said hot water between brewing chambers (7, 8) containing a substance that is to be infused, Characterized in that, The distribution means comprise for each brewing chamber (7, 8) means for detecting the presence of the substance to be infused and means for opening the hot water inlet into brewing chamber (7, 8) upon detection of the presence of the substance to be infused.
 2. Device according to claim 1, Characterized in that, It comprises, for each brewing chamber (7, 8), a mobile member (29 a, 29 b) between: a hot water inlet shutoff position in which one end of the mobile member (29 a, 29 b) is deployed inside brewing chamber (7, 8), a hot water inlet open position in which said end of mobile member (29 a, 29 b) is retracted from brewing chamber (7, 8) by bearing on the substance to be infused.
 3. Device according to claim 1, Characterized in that, Brewing chambers (7, 8) are formed in part in a fixed component (9) and in part in a mobile component (10) between an open position and a closed position of brewing chambers (7, 8).
 4. Device according to claim 3, Characterized in that, Fixed component (9) and mobile component (10) are connected by swivel pin (19), Mobile component (10) is actuated by a lever (18) mounted on the fixed component by pin (17 a, 17 b) and comprising at least one oblong hole (20 a, 20 b) cooperating with a guide finger (21 a, 21 b) on mobile component (10).
 5. Device according to claim 4, Characterized in that, Guide finger (21 a, 21 b) has a rectangular section and is mounted swiveling in relation to mobile component (10).
 6. Device according to any claim 4, Characterized in that, At least one portion of the wall of oblong hole (20 a, 20 b) comprises a slip coating (22 a, 22 b).
 7. Device according to claim 5, Characterized in that, Mobile component (10) comprises, for each brewing chamber (7, 8) a filtering cup (12 a, 12 b) supported by a holder (11 a, 11 b) adjustable in height inside a housing (23 a, 23 b) formed in mobile component (10).
 8. Device according to claim 7 in combination, Characterized in that, It comprises two brewing chambers (7, 8) each with a holder (11 a, 11 b) mounted adjustable in height inside its housing (23 a, 23 b) by a pressure screw (15 a, 15 b) serving also to mount a guide finger (21 a, 21 b).
 9. Machine for producing drinks from a substance to be infused comprising a hot water supply source, Characterized in that, It comprises at least one device according to claim
 1. 10. Device according to claim 2, Characterized in that, Brewing chambers (7, 8) are formed in part in a fixed component (9) and in part in a mobile component (10) between an open position and a closed position of brewing chambers (7, 8).
 11. Device according to claim 10, Characterized in that, Fixed component (9) and mobile component (10) are connected by swivel pin (19), Mobile component (10) is actuated by a lever (18) mounted on the fixed component by pin (17 a, 17 b) and comprising at least one oblong hole (20 a, 20 b) cooperating with a guide finger (21 a, 21 b) on mobile component (10).
 12. Device according to claim 5, Characterized in that, At least one portion of the wall of oblong hole (20 a, 20 b) comprises a slip coating (22 a, 22 b).
 13. Device according to claim 3, Characterized in that, Mobile component (10) comprises, for each brewing chamber (7, 8) a filtering cup (12 a, 12 b) supported by a holder (11 a, 11 b) adjustable in height inside a housing (23 a, 23 b) formed in mobile component (10).
 14. Device according to claim 4, Characterized in that, Mobile component (10) comprises, for each brewing chamber (7, 8) a filtering cup (12 a, 12 b) supported by a holder (11 a, 11 b) adjustable in height inside a housing (23 a, 23 b) formed in mobile component (10). 